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—		it-artikel:my-solution-on-assignment-1-problem-3 [2009-10-10 06:30] (aktuell) mail@awerner.homeip.net angelegt
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		+	====== My Solution on Assignment 1 - Problem 3 ======
		+
		+	This is my Solution of Assignment 1 - Problem 3 from the [[http://see.stanford.edu/see/courseinfo.aspx?coll=824a47e1-135f-4508-a5aa-866adcae1111|Computer Science Course CS106A of Prof. Mehran Sahami]] at the [[http://www.stanford.edu|STANDFORD University]].
		+
		+	<code>
		+	/*
		+	* File: CheckerboardKarel.java
		+	* ----------------------------
		+	* When you finish writing it, the CheckerboardKarel class should draw
		+	* a checkerboard using beepers, as described in Assignment 1.  You
		+	* should make sure that your program works for all of the sample
		+	* worlds supplied in the starter folder.
		+	*/
		+
		+	import stanford.karel.*;
		+
		+	public class CheckerboardKarel extends SuperKarel {
		+
		+
		+	public void run() {
		+	/* fills a checkerboard of ANY SIZE.
		+	*
		+	* Pre-condition: Karel starts at 1,1 facing EAST
		+	*/
		+	while( leftIsClear() ) {
		+	fillLine();
		+	goLineUp();
		+	}
		+	fillLine();
		+	}
		+
		+
		+	private void fillLine() {
		+	/* Fills a whole Line with either Pattern1 or Pattern2
		+	* depending on what kind of Pattern has been set on the
		+	* last line (1 row down)
		+	*/
		+
		+	// check if this is NOT the FIRST LINE
		+	if( rightIsClear() ) {
		+
		+	turnRight();
		+	move();
		+	if ( beepersPresent() ) {
		+	turnAround();
		+	move();
		+	turnRight();
		+	fillLineWithPattern2();
		+	}
		+	else {
		+	turnAround();
		+	move();
		+	turnRight();
		+	fillLineWithPattern1();
		+	}
		+	}
		+	else {
		+	// So this is the FIRST line ...
		+	fillLineWithPattern1();
		+	}
		+
		+	}
		+
		+	private void fillLineWithPattern1() {
		+	/* Fills a whole Line with Pattern1
		+	*/
		+	while( frontIsClear() ) {
		+	putBeeper();
		+	move();
		+	// Front STILL clear?? Then do another Step.
		+	if( frontIsClear() ) {
		+	move();
		+	}
		+	}
		+
		+	// GO ONE STEP BACK
		+	turnAround();
		+	move();
		+	turnAround();
		+
		+	if( noBeepersPresent() ) {
		+	move();
		+	putBeeper();
		+	}
		+
		+	returnToX1();
		+	}
		+
		+	private void returnToX1() {
		+
		+	// Now Go Back to X=1 (Left Wall) facing EAST
		+	turnAround();
		+	while( frontIsClear() ) {
		+	move();
		+	}
		+	turnAround();
		+	}
		+
		+
		+	private void fillLineWithPattern2() {
		+	/* Fills a whole Line with Pattern2
		+	*/
		+	while( frontIsClear() ) {
		+	move();
		+	putBeeper();
		+	// Front STILL clear?? Then do another Step.
		+	if( frontIsClear() ) {
		+	move();
		+	}
		+	}
		+	returnToX1();
		+	}
		+
		+
		+
		+	private void goLineUp() {
		+	/* Jumps ONE LINE UP
		+	*/
		+	turnLeft();
		+	move();
		+	turnRight();
		+	}
		+	}
		+
		+	</code>